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authorArnaldo Carvalho de Melo <acme@ghostprotocols.net>2005-08-09 23:12:30 -0400
committerDavid S. Miller <davem@sunset.davemloft.net>2005-08-29 18:49:40 -0400
commitc4365c9235f80128c3c3d5993074173941b1c1f0 (patch)
treef507b8360bab9f4c86050d75bb7372aa28ce890e
parentd8c97a9451068dd9f7b838a240bb6db894133a5e (diff)
[RANDOM]: Introduce secure_dccp_sequence_number
Code contributed by Stephen Hemminger. Signed-off-by: Arnaldo Carvalho de Melo <acme@ghostprotocols.net> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--drivers/char/random.c34
-rw-r--r--include/linux/random.h2
2 files changed, 36 insertions, 0 deletions
diff --git a/drivers/char/random.c b/drivers/char/random.c
index 6b11d6b2129f..7999da25fe40 100644
--- a/drivers/char/random.c
+++ b/drivers/char/random.c
@@ -1589,6 +1589,40 @@ u32 secure_tcpv6_port_ephemeral(const __u32 *saddr, const __u32 *daddr, __u16 dp
1589EXPORT_SYMBOL(secure_tcpv6_port_ephemeral); 1589EXPORT_SYMBOL(secure_tcpv6_port_ephemeral);
1590#endif 1590#endif
1591 1591
1592#if defined(CONFIG_IP_DCCP) || defined(CONFIG_IP_DCCP_MODULE)
1593/* Similar to secure_tcp_sequence_number but generate a 48 bit value
1594 * bit's 32-47 increase every key exchange
1595 * 0-31 hash(source, dest)
1596 */
1597u64 secure_dccp_sequence_number(__u32 saddr, __u32 daddr,
1598 __u16 sport, __u16 dport)
1599{
1600 struct timeval tv;
1601 u64 seq;
1602 __u32 hash[4];
1603 struct keydata *keyptr = get_keyptr();
1604
1605 hash[0] = saddr;
1606 hash[1] = daddr;
1607 hash[2] = (sport << 16) + dport;
1608 hash[3] = keyptr->secret[11];
1609
1610 seq = half_md4_transform(hash, keyptr->secret);
1611 seq |= ((u64)keyptr->count) << (32 - HASH_BITS);
1612
1613 do_gettimeofday(&tv);
1614 seq += tv.tv_usec + tv.tv_sec * 1000000;
1615 seq &= (1ull << 48) - 1;
1616#if 0
1617 printk("dccp init_seq(%lx, %lx, %d, %d) = %d\n",
1618 saddr, daddr, sport, dport, seq);
1619#endif
1620 return seq;
1621}
1622
1623EXPORT_SYMBOL(secure_dccp_sequence_number);
1624#endif
1625
1592#endif /* CONFIG_INET */ 1626#endif /* CONFIG_INET */
1593 1627
1594 1628
diff --git a/include/linux/random.h b/include/linux/random.h
index cc6703449916..7b2adb3322d5 100644
--- a/include/linux/random.h
+++ b/include/linux/random.h
@@ -59,6 +59,8 @@ extern __u32 secure_tcp_sequence_number(__u32 saddr, __u32 daddr,
59 __u16 sport, __u16 dport); 59 __u16 sport, __u16 dport);
60extern __u32 secure_tcpv6_sequence_number(__u32 *saddr, __u32 *daddr, 60extern __u32 secure_tcpv6_sequence_number(__u32 *saddr, __u32 *daddr,
61 __u16 sport, __u16 dport); 61 __u16 sport, __u16 dport);
62extern u64 secure_dccp_sequence_number(__u32 saddr, __u32 daddr,
63 __u16 sport, __u16 dport);
62 64
63#ifndef MODULE 65#ifndef MODULE
64extern struct file_operations random_fops, urandom_fops; 66extern struct file_operations random_fops, urandom_fops;